big refactoring: classes related to accounts

...in/java/de/deadlocker8/budgetmaster/accounts/Account.java

.../deadlocker8/budgetmaster/accounts/AccountController.java

.../deadlocker8/budgetmaster/accounts/AccountRepository.java

.../de/deadlocker8/budgetmaster/accounts/AccountService.java

...ava/de/deadlocker8/budgetmaster/accounts/AccountType.java

...e/deadlocker8/budgetmaster/accounts/AccountValidator.java

...java/de/deadlocker8/budgetmaster/authentication/User.java

.../deadlocker8/budgetmaster/authentication/UserService.java

...deadlocker8/budgetmaster/controller/ReportController.java

...adlocker8/budgetmaster/controller/SettingsController.java

...n/java/de/deadlocker8/budgetmaster/database/Database.java

.../deadlocker8/budgetmaster/database/DatabaseParser_v3.java

...r8/budgetmaster/database/accountmatches/AccountMatch.java

...eadlocker8/budgetmaster/database/legacy/LegacyParser.java

...de/deadlocker8/budgetmaster/services/DatabaseService.java

.../de/deadlocker8/budgetmaster/services/HelpersService.java

...de/deadlocker8/budgetmaster/transactions/Transaction.java

...ker8/budgetmaster/transactions/TransactionController.java

...ker8/budgetmaster/transactions/TransactionRepository.java

...locker8/budgetmaster/transactions/TransactionService.java